#include <stdio.h>
#include <string.h>
#include <stdlib.h>

void Usage(const char* name){
  printf("\nUsage: %s -[a|b|c]\n\n",name);
}

int main(int argc, char* argv[]){
  if(argc != 2)
    Usage(argv[0]);
  if(strcmp(argv[1],"-a") == 0)
    printf("1:-a\n");
  else if(strcmp(argv[1],"-b") == 0)
    printf("2:-b\n");
  else if(strcmp(argv[1],"-c") == 0)
    printf("3:-c\n");
  else 
    printf("x\n");

  return 0;
}
